I am facing the same problem. I live in a urban, almost saturated region. I tried to hide a traditional cache but it is 'mission impossible'
There are two problems:
- a lot of caches are extremely difficult mystery caches with a lot of protected waypoints. I'm not able to solve them. Only a few can. So, putting all waypoints in GSAK doesn't solve the problem (and besides that, I have a Mac... ;-) )
- most caches are placed years ago by a limited number of people, mostly very experienced users.
This means that
- hiding caches is something for the 'happy few', monopolizing the region
- newbies aren't very motivated to hide new caches
So I support the idea to show colored spots.